Question

Answer this plz
$n = 20 find sn$

Answer 1

without the values of "a" Nd "d" how can v calculate Sn

Answer 2

Heya

Your solution is given below :

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Solution :

Given that

=> n = 20 ( number of terms )

=> find sum of n(20) terms =?

We know that,

=> Sn = n/2 x { 2a + ( n-1 ) d }

=> Sn = 20 / 2 x { 2a + 19d }

=> Sn = 10 x ( 2a + 19d )

=> Sn = 20a + 190d <== answer.
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I hope it will help you

Thanks.